High-Accuracy, Low-Dropout

Linear Regulators

4

_______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

3.29679

3.29904

3.29455

3.29231

3.29007

3.28783

3.30128

3.30352

3.30576

3.30800

3.31024

3.31248

3.31472

3.31696

3.31920

3.32145

0

50

100

NUMBER OF UNITS

250

200

150

MAX688

OUTPUT VOLTAGE DISTRIBUTION

3.28365

3.28722

3.29078

3.29435

3.29792

3.30149

3.30505

3.30862

3.31219

3.31576

3.31932

3.32289

0

50

100

250

200

150

MAX687

OUTPUT VOLTAGE DISTRIBUTION

NUMBER OF UNITS

2.98975

2.99150

2.99324

2.99499

2.99674

2.99848

3.00023

3.00198

3.00372

3.00547

3.00721

3.00896

3.01071

3.01245

3.01420

3.01595

0

50

100

250

200

150

MAX689

OUTPUT VOLTAGE DISTRIBUTION

NUMBER OF UNITS

7

6

5

4

3

2

1

0

0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

GND CURRENT vs. DROPOUT VOLTAGE

300mA LOAD

100mA LOAD

10mA LOAD

0

0.05

0.10

0.15

0.20

0.25

0.30

0

200

600

1000

1400

1800

DROPOUT VOLTAGE

vs. LOAD CURRENT

LOAD CURRENT (mA)

Q1 = FZT749

OBSERVE MAXIMUM POWER

DISSIPATION LIMIT OF

EXTERNAL PASS TRANSISTOR.

0

1

2

3

4

5

6

0

200

400

600

800

1000 1200

GND CURRENT

vs. LOAD CURRENT

LOAD CURRENT (mA)

7

6

5

4

3

2

1

0

08

12

34

5

7

6

GND CURRENT vs. DROPOUT VOLTAGE

300mA LOAD

100mA LOAD

10mA LOAD

146

126

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

130

128

134

132

138

136

142

144

140

TEMPERATURE (°C)

-55

-25

0

25

50

75

100

125

1.0

0

0

200

600

1000

DROPOUT VOLTAGE

vs. LOAD CURRENT

0.2

0.1

0.4

0.3

0.6

0.5

0.8

0.9

0.7

LOAD CURRENT (mA)

400

800

Q1 = 2N2907